The Vampire Diaries (“We’ll Always Have Bourbon Street”) – When Stefan comes to Damon with a suspicion about Elena, the brothers start an investigation; Elena shares shocking news; Hayley wants Tyler to confront one of Klaus’ hybrids. (The CW)

8:30 PM EST

Two and a Half Men (“One Nut Johnson”) – Alan helps Walden create a new identity so he can avoid women who are only interested in his money. (CBS)

Up All Night (“I Can’t Quit You”) – Reagan’s loyalty to Scott is tested when his ex-wife re-enters her life; Ava decides she can still make a difference even without her show. (NBC)

Grey’s Anatomy (“Love Turns You Upside Down”) – Meredith asks Heather to help fix Derek’s hand; Cristina sets Stephanie and Leah against each other in a competition; Alex starts to see Jo differently; Shane learns a valuable lesson from April. (ABC)

Project Runway All Stars (“Green Dress for the Red Carpet”) – The designers must create a red carpet look using only eco-friendly fabrics and materials. (Lifetime)

Person of Interest (“C.O.D.”) – When the machine names a New York cabdriver as a person of interest, any of his passengers could be a part of the impending crime. (CBS)

The Office (“Dwight Christmas”) – Dwight picks up the slack when the party planning committee fails to plan a Christmas party; Darryl worries Jim has forgotten the promise he made; Pete teaches Erin about “Die Hard.” (NBC)

It’s Always Sunny in Philadelphia (“Charlie Rules the World”) – The gang tries to define the difference between the real and the virtual worlds after slipping into an unhealthy obsession with computer games. (FX)

The League (“The Anchor Baby”) – Ruxin is worried that Sofia has soured on their marriage; the guys try to get rid of an undesirable acquaintance; Jenny uses insider information to make a dirty trade. (FX)